Small brook (4)

I think it could be either:

Which length description are you looking for?:

rill

'small brook' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for rill that I've seen before include "Little stream" , "Brooklet" , "Burn" , "Small brook" , "Flow of water" .)

I've seen this clue in The Mirror, The Times, The Sunday Times, The Guardian, The Washington Post, The New York Times and The Sun.

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